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<head><meta charset="utf-8"><title>weekly meeting 2019-08-15 #54818 · t-compiler · Zulip Chat Archive</title></head>
<h2>Stream: <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/index.html">t-compiler</a></h2>
<h3>Topic: <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html">weekly meeting 2019-08-15 #54818</a></h3>

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<a name="173288125"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173288125" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173288125">(Aug 15 2019 at 13:05)</a>:</h4>
<p>Hi <span class="user-group-mention" data-user-group-id="897">@T-compiler/meeting</span> ; the triage meeting will be starting in ~55 minutes</p>



<a name="173288192"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173288192" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173288192">(Aug 15 2019 at 13:06)</a>:</h4>
<p>I will be doing <a href="#narrow/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-08-15.20.2354818" title="#narrow/stream/131828-t-compiler/topic/pre-meeting.20triage.202019-08-15.20.2354818">pre-triage in a parallel topic</a></p>



<a name="173288211"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173288211" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> davidtwco <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173288211">(Aug 15 2019 at 13:07)</a>:</h4>
<p><span class="user-mention" data-user-id="116009">@nikomatsakis</span> just in case you missed it while away, working group check-ins are on the website now: <a href="https://rust-lang.github.io/compiler-team/about/triage-meeting/" target="_blank" title="https://rust-lang.github.io/compiler-team/about/triage-meeting/">https://rust-lang.github.io/compiler-team/about/triage-meeting/</a></p>



<a name="173288244"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173288244" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173288244">(Aug 15 2019 at 13:07)</a>:</h4>
<p>Cool, I was just looking for that</p>



<a name="173288367"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173288367" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173288367">(Aug 15 2019 at 13:09)</a>:</h4>
<p><span class="user-mention" data-user-id="116107">@davidtwco</span> that said, it seems to be off by a week?</p>



<a name="173288389"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173288389" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173288389">(Aug 15 2019 at 13:09)</a>:</h4>
<p>maybe it needs to be "regenerated" once a week or something?</p>



<a name="173288461"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173288461" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> davidtwco <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173288461">(Aug 15 2019 at 13:10)</a>:</h4>
<p>It's all generated in your browser, I must have an off-by-one somewhere. <span aria-label="face palm" class="emoji emoji-1f926" role="img" title="face palm">:face_palm:</span></p>



<a name="173288475"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173288475" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173288475">(Aug 15 2019 at 13:10)</a>:</h4>
<p>:) I'll go by the dates in any case, I presume</p>



<a name="173288489"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173288489" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173288489">(Aug 15 2019 at 13:10)</a>:</h4>
<p>This week the check-in schedule suggests checkins from:</p>
<ul>
<li><span class="user-group-mention" data-user-group-id="1380">@WG-learning</span>  -- maybe <span class="user-mention" data-user-id="116266">@Santiago Pastorino</span>  can give an update?</li>
<li><span class="user-group-mention" data-user-group-id="1176">@WG-llvm</span>  -- maybe <span class="user-mention" data-user-id="123586">@nagisa</span> or <span class="user-mention" data-user-id="133224">@Nikita Popov</span> can give an update?</li>
</ul>



<a name="173288945"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173288945" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> davidtwco <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173288945">(Aug 15 2019 at 13:16)</a>:</h4>
<blockquote>
<p><span aria-label="slight smile" class="emoji emoji-1f642" role="img" title="slight smile">:slight_smile:</span> I'll go by the dates in any case, I presume</p>
</blockquote>
<p>(I've put <a href="https://github.com/rust-lang/compiler-team/pull/154" target="_blank" title="https://github.com/rust-lang/compiler-team/pull/154">a PR up</a> that fixes the website)</p>



<a name="173290520"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173290520" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173290520">(Aug 15 2019 at 13:37)</a>:</h4>
<p>oops, for some reason I thought it was still Wednesday :D</p>



<a name="173292860"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173292860" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173292860">(Aug 15 2019 at 14:02)</a>:</h4>
<p>Hello <span class="user-group-mention" data-user-group-id="897">@T-compiler/meeting</span> =) meeting starting</p>



<a name="173292887"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173292887" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173292887">(Aug 15 2019 at 14:03)</a>:</h4>
<p>Let's start with a few minutes for announcements</p>



<a name="173292897"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173292897" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173292897">(Aug 15 2019 at 14:03)</a>:</h4>
<p>while people accumulate.</p>



<a name="173292903"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173292903" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173292903">(Aug 15 2019 at 14:03)</a>:</h4>
<p>anything fun/interesting/boring going on? :)</p>



<a name="173292915"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173292915" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173292915">(Aug 15 2019 at 14:03)</a>:</h4>
<p>probably the biggest thing is people coming back from vacations :D</p>



<a name="173292946"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173292946" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173292946">(Aug 15 2019 at 14:03)</a>:</h4>
<p>I'm debating if <span aria-label="tada" class="emoji emoji-1f389" role="img" title="tada">:tada:</span> is appropriate for this</p>



<a name="173293004"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293004" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293004">(Aug 15 2019 at 14:04)</a>:</h4>
<p>Place 2.0 (spearheaded by <span class="user-mention" data-user-id="116266">@Santiago Pastorino</span> ) is now a WIP PR: <a href="https://github.com/rust-lang/rust/pull/63420" target="_blank" title="https://github.com/rust-lang/rust/pull/63420">https://github.com/rust-lang/rust/pull/63420</a></p>



<a name="173293012"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293012" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293012">(Aug 15 2019 at 14:04)</a>:</h4>
<p>1.37.0 is being released as we speak.</p>



<a name="173293019"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293019" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293019">(Aug 15 2019 at 14:04)</a>:</h4>
<p>async-await is <em>very close</em> to stabilizing on nightly</p>



<a name="173293030"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293030" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293030">(Aug 15 2019 at 14:04)</a>:</h4>
<p>at least last time I checked :)</p>



<a name="173293038"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293038" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293038">(Aug 15 2019 at 14:04)</a>:</h4>
<p>ye</p>



<a name="173293047"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293047" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293047">(Aug 15 2019 at 14:04)</a>:</h4>
<p>crater is slow</p>



<a name="173293075"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293075" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293075">(Aug 15 2019 at 14:05)</a>:</h4>
<p>I bumped the PR to the top of the queue, crater is testing it now</p>



<a name="173293089"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293089" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293089">(Aug 15 2019 at 14:05)</a>:</h4>
<p>more seriously: I'm finally starting to upstream the new demangler to tools, there will be a few small patches to GCC then the actual big patch (I don't want to do it all at once because GNU has no nice concept of revision history within a patch...)</p>



<a name="173293097"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293097" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Pietro Albini <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293097">(Aug 15 2019 at 14:05)</a>:</h4>
<p>hopefully we should get more crater capacity soonish</p>



<a name="173293098"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293098" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293098">(Aug 15 2019 at 14:05)</a>:</h4>
<p>( Running (38%) )</p>



<a name="173293099"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293099" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293099">(Aug 15 2019 at 14:05)</a>:</h4>
<p>this is from yesterday: <a href="https://gcc.gnu.org/ml/gcc-patches/2019-08/msg01007.html" target="_blank" title="https://gcc.gnu.org/ml/gcc-patches/2019-08/msg01007.html">https://gcc.gnu.org/ml/gcc-patches/2019-08/msg01007.html</a></p>



<a name="173293119"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293119" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293119">(Aug 15 2019 at 14:05)</a>:</h4>
<p>if someone wants to help review my C code, they're welcome :P</p>



<a name="173293194"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293194" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293194">(Aug 15 2019 at 14:06)</a>:</h4>
<p>what will eventually be upstreamed is this: <a href="https://gist.github.com/eddyb/c41a69378750a433767cf53fe2316768" target="_blank" title="https://gist.github.com/eddyb/c41a69378750a433767cf53fe2316768">https://gist.github.com/eddyb/c41a69378750a433767cf53fe2316768</a></p>



<a name="173293227"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293227" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293227">(Aug 15 2019 at 14:07)</a>:</h4>
<p>to GCC (which flows into binutils and gdb), valgrind, linux-perf and, somehow, lldb (not sure yet where that belongs lol)</p>



<a name="173293228"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293228" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293228">(Aug 15 2019 at 14:07)</a>:</h4>
<p>OK, let's get started.</p>



<a name="173293263"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293263" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293263">(Aug 15 2019 at 14:07)</a>:</h4>
<p>Agenda:</p>
<ul>
<li>discuss a few nominated, p-high issues</li>
<li>beta backports</li>
<li>wg-checkins:<br>
    - <span class="user-group-mention" data-user-group-id="1380">@WG-learning</span> <br>
    - <span class="user-group-mention" data-user-group-id="1176">@WG-llvm</span></li>
</ul>



<a name="173293276"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293276" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293276">(Aug 15 2019 at 14:07)</a>:</h4>
<p>Not sure who's doing those check-ins yet :)</p>



<a name="173293280"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293280" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293280">(Aug 15 2019 at 14:07)</a>:</h4>
<p>(oh, I could ask WG-llvm about lldb :P)</p>



<a name="173293339"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293339" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293339">(Aug 15 2019 at 14:08)</a>:</h4>
<p>So I had a few issues that I thought might be worth raising that come up during pre-triage</p>



<a name="173293360"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293360" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293360">(Aug 15 2019 at 14:08)</a>:</h4>
<blockquote>
<p>segfault with target-feature=+soft-float <a href="https://github.com/rust-lang/rust/issues/63466" target="_blank" title="https://github.com/rust-lang/rust/issues/63466">#63466</a></p>
</blockquote>



<a name="173293377"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293377" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293377">(Aug 15 2019 at 14:08)</a>:</h4>
<p><span class="user-mention" data-user-id="133224">@Nikita Popov</span> left a comment there indicating that soft-float may require more flags</p>



<a name="173293401"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293401" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293401">(Aug 15 2019 at 14:09)</a>:</h4>
<p>ah <span class="user-mention" data-user-id="124289">@rkruppe</span> too</p>



<a name="173293422"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293422" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293422">(Aug 15 2019 at 14:09)</a>:</h4>
<p>Seems our static semantics are wrong then?</p>



<a name="173293423"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293423" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293423">(Aug 15 2019 at 14:09)</a>:</h4>
<p>It <em>seems</em> like the question here then is more "can we document these gotchas somewhere"</p>



<a name="173293445"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293445" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293445">(Aug 15 2019 at 14:09)</a>:</h4>
<p>i.e. if something requires a flag then the absence of said flag should result in a compilation failure of some sort</p>



<a name="173293514"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293514" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293514">(Aug 15 2019 at 14:10)</a>:</h4>
<p>/me appears</p>



<a name="173293522"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293522" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293522">(Aug 15 2019 at 14:10)</a>:</h4>
<p>target features are a bit of a tricky issue</p>



<a name="173293528"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293528" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293528">(Aug 15 2019 at 14:10)</a>:</h4>
<p>but yes perhaps we could add some kind of sanity check</p>



<a name="173293568"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293568" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293568">(Aug 15 2019 at 14:11)</a>:</h4>
<p><span class="user-mention" data-user-id="123586">@nagisa</span> you may have informed opinions on this :)</p>



<a name="173293603"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293603" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293603">(Aug 15 2019 at 14:11)</a>:</h4>
<p>but maybe better not to dig <em>too</em> far into the weeds here -- let me ask this -- does somebody want to try and draw up what possible actions we could take?</p>



<a name="173293653"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293653" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293653">(Aug 15 2019 at 14:12)</a>:</h4>
<p>I don't have much of an opinion but the current situation seems ungreat</p>



<a name="173293660"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293660" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293660">(Aug 15 2019 at 14:12)</a>:</h4>
<p>of course maybe there are docs, I guess, I didn't even look</p>



<a name="173293662"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293662" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293662">(Aug 15 2019 at 14:12)</a>:</h4>
<p>My overall opinion is that <code>target-feature</code>s are semi-unsafe and need to be used in an informed manner. This applies to most of them.</p>



<a name="173293683"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293683" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293683">(Aug 15 2019 at 14:12)</a>:</h4>
<p>this is also my opinion</p>



<a name="173293701"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293701" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293701">(Aug 15 2019 at 14:13)</a>:</h4>
<p>but I <em>would</em> like to help people become informed where we can...</p>



<a name="173293706"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293706" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293706">(Aug 15 2019 at 14:13)</a>:</h4>
<p>you can find a bunch of ways to make produced artifacts fail in ways after sticking in an unusual flag in rustc.</p>



<a name="173293793"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293793" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293793">(Aug 15 2019 at 14:14)</a>:</h4>
<p>I guess emitting some sort of warning on <code>rustc -Chelp</code> etc would be maybe good</p>



<a name="173293799"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293799" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293799">(Aug 15 2019 at 14:14)</a>:</h4>
<p>but unlikely to have prevented this bug from being filed</p>



<a name="173293812"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293812" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293812">(Aug 15 2019 at 14:15)</a>:</h4>
<p>in my ideal world, the <a href="https://doc.rust-lang.org/rustc/index.html" target="_blank" title="https://doc.rust-lang.org/rustc/index.html">rustc book</a> would discuss target features and some common gotchas</p>



<a name="173293838"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293838" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293838">(Aug 15 2019 at 14:15)</a>:</h4>
<p>i.e., I'd like to be able to close with a link to a section explaining the dangers</p>



<a name="173293854"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293854" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293854">(Aug 15 2019 at 14:15)</a>:</h4>
<p>even if that section were pretty short to start</p>



<a name="173293944"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293944" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293944">(Aug 15 2019 at 14:16)</a>:</h4>
<p>I'll leave comments that we consider the features semi unsafe and would like to document for now, mark as p-medium I guess, doesn't seem p-high</p>



<a name="173293955"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293955" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293955">(Aug 15 2019 at 14:16)</a>:</h4>
<p>maybe close in favor of an issue saying to document them this way</p>



<a name="173293956"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293956" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293956">(Aug 15 2019 at 14:16)</a>:</h4>
<p>documenting may be p-high?</p>



<a name="173293970"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293970" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293970">(Aug 15 2019 at 14:17)</a>:</h4>
<p>I'll nominate :)</p>



<a name="173293996"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173293996" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173293996">(Aug 15 2019 at 14:17)</a>:</h4>
<p>ok, jotted that down for after meeting</p>



<a name="173294008"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294008" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294008">(Aug 15 2019 at 14:17)</a>:</h4>
<p>next bug:</p>
<blockquote>
<p>Stable rustc always panics on arm/musl <a href="https://github.com/rust-lang/rust/issues/60297" target="_blank" title="https://github.com/rust-lang/rust/issues/60297">#60297</a></p>
</blockquote>



<a name="173294015"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294015" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294015">(Aug 15 2019 at 14:17)</a>:</h4>
<p>I think the last time we talked about this, we talked about trying to setup some kind of virtualization setup?</p>



<a name="173294020"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294020" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294020">(Aug 15 2019 at 14:17)</a>:</h4>
<p>to help in reproducing these sorts of things?</p>



<a name="173294093"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294093" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294093">(Aug 15 2019 at 14:18)</a>:</h4>
<p>/me points out <a href="https://cfarm.tetaneutral.net/machines/list/" target="_blank" title="https://cfarm.tetaneutral.net/machines/list/">https://cfarm.tetaneutral.net/machines/list/</a> again.</p>



<a name="173294102"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294102" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294102">(Aug 15 2019 at 14:18)</a>:</h4>
<p>can anybody leave any notes on how one might do that? even just a few high-levle things like "use qemu" -- I could maybe pursue..</p>



<a name="173294105"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294105" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294105">(Aug 15 2019 at 14:18)</a>:</h4>
<p>ok, or that :)</p>



<a name="173294141"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294141" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294141">(Aug 15 2019 at 14:19)</a>:</h4>
<p>it feels like we should be able to fix this bug :) I feel like arm and musl may not technically be tier 1 (prob not..) but still feel like important targets we should be able to test</p>



<a name="173294210"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294210" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294210">(Aug 15 2019 at 14:20)</a>:</h4>
<p>well, let's highlight it for a "call for volunteers" section at least</p>



<a name="173294223"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294223" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294223">(Aug 15 2019 at 14:20)</a>:</h4>
<p>(ps <span class="user-mention" data-user-id="125250">@Wesley Wiser</span> are you going to be making minutes?)</p>



<a name="173294233"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294233" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294233">(Aug 15 2019 at 14:20)</a>:</h4>
<p>Yes</p>



<a name="173294239"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294239" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294239">(Aug 15 2019 at 14:20)</a>:</h4>
<p>I'll be sure to include it</p>



<a name="173294244"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294244" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294244">(Aug 15 2019 at 14:21)</a>:</h4>
<p>next up, a question: there are a few p-high issues (e.g., <a href="https://github.com/rust-lang/rust/issues/42516" target="_blank" title="https://github.com/rust-lang/rust/issues/42516">#42516</a>, <a href="https://github.com/rust-lang/rust/issues/21934" target="_blank" title="https://github.com/rust-lang/rust/issues/21934">#21934</a>) that seem like they are p-high for <em>diagnostics</em> more than p-high in general</p>



<a name="173294259"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294259" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294259">(Aug 15 2019 at 14:21)</a>:</h4>
<p>I guess this comes down to us needing to discuss further our labeling schemes</p>



<a name="173294282"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294282" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294282">(Aug 15 2019 at 14:21)</a>:</h4>
<p>let's leave that topic for now but I wanted to plan the seed that we should continu to look for a more useful priority system</p>



<a name="173294286"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294286" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294286">(Aug 15 2019 at 14:21)</a>:</h4>
<h1>beta nominations</h1>



<a name="173294295"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294295" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294295">(Aug 15 2019 at 14:21)</a>:</h4>
<p>(ooh, zulip respects <code>#</code> now...)</p>



<a name="173294347"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294347" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294347">(Aug 15 2019 at 14:22)</a>:</h4>
<p>(are we doing this with polls now?)</p>



<a name="173294354"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294354" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294354">(Aug 15 2019 at 14:22)</a>:</h4>
<p>(or do they continue to not work on mobile?)</p>



<a name="173294363"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294363" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294363">(Aug 15 2019 at 14:22)</a>:</h4>
<p>probably don't work</p>



<a name="173294367"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294367" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294367">(Aug 15 2019 at 14:22)</a>:</h4>
<p>:/</p>



<a name="173294370"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294370" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Wesley Wiser <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294370">(Aug 15 2019 at 14:22)</a>:</h4>
<p>(Is anyone on mobile?)</p>



<a name="173294380"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294380" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294380">(Aug 15 2019 at 14:22)</a>:</h4>
<p>usually some people are, don't know</p>



<a name="173294383"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294383" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294383">(Aug 15 2019 at 14:22)</a>:</h4>
<p>Zulip mobile is dead to me anyway because it destroys the battery</p>



<a name="173294415"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294415" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294415">(Aug 15 2019 at 14:23)</a>:</h4>
<blockquote>
<p>Point at the right enclosing scope when using <code>await</code> in non-async fn <a href="https://github.com/rust-lang/rust/issues/63509" target="_blank" title="https://github.com/rust-lang/rust/issues/63509">#63509</a></p>
</blockquote>



<a name="173294482"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294482" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294482">(Aug 15 2019 at 14:24)</a>:</h4>
<blockquote>
<p>Do not ICE when synthesizing spans falling inside unicode chars <a href="https://github.com/rust-lang/rust/issues/63508" target="_blank" title="https://github.com/rust-lang/rust/issues/63508">#63508</a></p>
</blockquote>



<a name="173294515"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294515" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294515">(Aug 15 2019 at 14:24)</a>:</h4>
<blockquote>
<p>Don't access a static just for its size and alignment <a href="https://github.com/rust-lang/rust/issues/62982" target="_blank" title="https://github.com/rust-lang/rust/issues/62982">#62982</a></p>
</blockquote>



<a name="173294524"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294524" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294524">(Aug 15 2019 at 14:24)</a>:</h4>
<p>Note that beta has been uplifted very recently</p>



<a name="173294547"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294547" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294547">(Aug 15 2019 at 14:25)</a>:</h4>
<p>I believe?</p>



<a name="173294549"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294549" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294549">(Aug 15 2019 at 14:25)</a>:</h4>
<p>so some of these may be outdated?</p>



<a name="173294557"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294557" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294557">(Aug 15 2019 at 14:25)</a>:</h4>
<p>indeed, you are correct</p>



<a name="173294561"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294561" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294561">(Aug 15 2019 at 14:25)</a>:</h4>
<p>Yeah, I was going to make exactly that point.</p>



<a name="173294566"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294566" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294566">(Aug 15 2019 at 14:25)</a>:</h4>
<p><a href="https://github.com/rust-lang/rust/issues/62982" target="_blank" title="https://github.com/rust-lang/rust/issues/62982">#62982</a> has already been backported</p>



<a name="173294587"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294587" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> oli <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294587">(Aug 15 2019 at 14:26)</a>:</h4>
<p>it already has a beta-accepted label</p>



<a name="173294631"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294631" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294631">(Aug 15 2019 at 14:26)</a>:</h4>
<p>oops, missed that, sorry</p>



<a name="173294637"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294637" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294637">(Aug 15 2019 at 14:26)</a>:</h4>
<p>With that in mind I’d <span aria-label="back" class="emoji emoji-1f519" role="img" title="back">:back:</span> all of them. If something did not make the cut, then backporting would give that code a full cycle of eyeballs anyway</p>



<a name="173294648"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294648" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294648">(Aug 15 2019 at 14:26)</a>:</h4>
<p>yeah, sounds fine</p>



<a name="173294682"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294682" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294682">(Aug 15 2019 at 14:27)</a>:</h4>
<p>ok, marking as beta-accepted</p>



<a name="173294691"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294691" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294691">(Aug 15 2019 at 14:27)</a>:</h4>
<p>if something didn't make the cut... isn't it going to be in beta soon anyway?</p>



<a name="173294700"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294700" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294700">(Aug 15 2019 at 14:27)</a>:</h4>
<p>since it presumably was already in nightly</p>



<a name="173294701"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294701" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294701">(Aug 15 2019 at 14:27)</a>:</h4>
<p>in about 6 weeks :)</p>



<a name="173294715"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294715" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294715">(Aug 15 2019 at 14:27)</a>:</h4>
<p>it makes no sense to beta backport <a href="https://github.com/rust-lang/rust/pull/63509" target="_blank" title="https://github.com/rust-lang/rust/pull/63509">https://github.com/rust-lang/rust/pull/63509</a></p>



<a name="173294720"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294720" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294720">(Aug 15 2019 at 14:27)</a>:</h4>
<p>at least <a href="https://github.com/rust-lang/rust/issues/63508" target="_blank" title="https://github.com/rust-lang/rust/issues/63508">#63508</a> landed yesterday</p>



<a name="173294732"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294732" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294732">(Aug 15 2019 at 14:27)</a>:</h4>
<p>oh I guess there is that race condition</p>



<a name="173294742"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294742" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294742">(Aug 15 2019 at 14:27)</a>:</h4>
<blockquote>
<p>it makes no sense to beta backport <a href="https://github.com/rust-lang/rust/pull/63509" target="_blank" title="https://github.com/rust-lang/rust/pull/63509">https://github.com/rust-lang/rust/pull/63509</a></p>
</blockquote>
<p>oh right, because it's about async-await?</p>



<a name="173294750"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294750" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294750">(Aug 15 2019 at 14:27)</a>:</h4>
<p>yep</p>



<a name="173294820"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294820" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294820">(Aug 15 2019 at 14:28)</a>:</h4>
<p>ok, rejecting</p>



<a name="173294827"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294827" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294827">(Aug 15 2019 at 14:28)</a>:</h4>
<p>I meant to ask about that but forgot</p>



<a name="173294850"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294850" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294850">(Aug 15 2019 at 14:29)</a>:</h4>
<p>compiler meeting day being release day is kind of bad from this perspective huh</p>



<a name="173294871"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294871" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294871">(Aug 15 2019 at 14:29)</a>:</h4>
<p>well the beta branched a few days back</p>



<a name="173294873"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294873" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294873">(Aug 15 2019 at 14:29)</a>:</h4>
<p>tuesday, I think</p>



<a name="173294885"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294885" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294885">(Aug 15 2019 at 14:29)</a>:</h4>
<p>I'm not enough of a monster to suggest we should hold meetings on monday,</p>



<a name="173294893"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294893" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294893">(Aug 15 2019 at 14:29)</a>:</h4>
<p>anyway, that's it for beta things</p>



<a name="173294993"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173294993" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173294993">(Aug 15 2019 at 14:30)</a>:</h4>
<p>OK, shall we do WG checkin?</p>



<a name="173295042"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295042" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295042">(Aug 15 2019 at 14:31)</a>:</h4>
<p>I can give the learning wg one when you want</p>



<a name="173295049"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295049" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295049">(Aug 15 2019 at 14:31)</a>:</h4>
<h1><span class="user-group-mention" data-user-group-id="1380">@WG-learning</span></h1>



<a name="173295052"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295052" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295052">(Aug 15 2019 at 14:31)</a>:</h4>
<p>ok :)</p>



<a name="173295057"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295057" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295057">(Aug 15 2019 at 14:31)</a>:</h4>
<p>For the ones that don't remember/don't know, <strong>wg-learning</strong> objective is to make the compiler easier to learn by ensuring that <strong>rustc-guide</strong> and <strong>api docs</strong> are "complete".</p>
<p>In that front right now we are mainly working on three things:</p>
<p>1. <strong>Get more compiler lectures from people that know some part of the compiler</strong> and want to share the knowledge, it doesn't need to be a very fancy thing. We have done video sessions and chat sessions on Zulip. If someone is interested in giving a lecture please let me know.<br>
2. <strong>Summarize exising lectures into rustc-guide chapters</strong>.<br>
3. Triage and keep working on <strong>issues</strong> and <strong>pull requests</strong>.<br>
To keep track of points 1 and 2 we are using <a href="https://github.com/rust-lang/rustc-guide/projects/2" target="_blank" title="https://github.com/rust-lang/rustc-guide/projects/2">this Github project</a> and there's this <a href="https://www.youtube.com/watch?v=mAUGvNgZYtw" target="_blank" title="https://www.youtube.com/watch?v=mAUGvNgZYtw">youtube playlist</a> with existing lectures.</p>
<p>We are making good progress, but <strong>help is always needed :)</strong>.</p>
<p>Giving a lecture, helping to summarize existing lectures, writing rustc-guide chapters and getting more people involved in this effort are things that would be great for the working group.</p>
<div class="youtube-video message_inline_image"><a data-id="mAUGvNgZYtw" href="https://www.youtube.com/watch?v=mAUGvNgZYtw" target="_blank" title="https://www.youtube.com/watch?v=mAUGvNgZYtw"><img src="https://i.ytimg.com/vi/mAUGvNgZYtw/default.jpg"></a></div>



<a name="173295079"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295079" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295079">(Aug 15 2019 at 14:31)</a>:</h4>
<p>Is there an easy way to see which lectures have been given, which are in progress, ec?</p>



<a name="173295128"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295128" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295128">(Aug 15 2019 at 14:32)</a>:</h4>
<p>I've obviously been out for a while so I'm interested in coming back up to speed</p>



<a name="173295143"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295143" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295143">(Aug 15 2019 at 14:32)</a>:</h4>
<p>Oh, I guess that's the Github Project you linked to</p>



<a name="173295147"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295147" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295147">(Aug 15 2019 at 14:32)</a>:</h4>
<p>yeah, click on the github project link</p>



<a name="173295157"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295157" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295157">(Aug 15 2019 at 14:32)</a>:</h4>
<p>there you will see progress and things assigned</p>



<a name="173295170"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295170" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295170">(Aug 15 2019 at 14:32)</a>:</h4>
<p>and in the youtube playlist you will find most of the lectures</p>



<a name="173295176"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295176" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295176">(Aug 15 2019 at 14:32)</a>:</h4>
<p>because we had one that was chat based</p>



<a name="173295219"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295219" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295219">(Aug 15 2019 at 14:33)</a>:</h4>
<p>very cool</p>



<a name="173295220"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295220" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295220">(Aug 15 2019 at 14:33)</a>:</h4>
<p>anyway you can also see the given lectures as the union of all the things in the github project maybe that's a better source of knowledge</p>



<a name="173295301"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295301" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295301">(Aug 15 2019 at 14:34)</a>:</h4>
<p>I see about 3 open PRs to the rustc-guide; I'm curious whether merging and editing has been difficult. In the past I know that it's sometimes been hard to get feedback etc</p>



<a name="173295310"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295310" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295310">(Aug 15 2019 at 14:34)</a>:</h4>
<p>or have most of the lectures not yet gotten to that stage?</p>



<a name="173295441"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295441" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295441">(Aug 15 2019 at 14:36)</a>:</h4>
<p>right now I don't remember very well</p>



<a name="173295450"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295450" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Santiago Pastorino <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295450">(Aug 15 2019 at 14:36)</a>:</h4>
<p>would need to check those particular prs</p>



<a name="173295461"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295461" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> centril <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295461">(Aug 15 2019 at 14:37)</a>:</h4>
<p>(We have a new release, <a href="https://blog.rust-lang.org/2019/08/15/Rust-1.37.0.html" target="_blank" title="https://blog.rust-lang.org/2019/08/15/Rust-1.37.0.html">https://blog.rust-lang.org/2019/08/15/Rust-1.37.0.html</a>)</p>



<a name="173295485"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295485" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295485">(Aug 15 2019 at 14:37)</a>:</h4>
<p>OK, great, then let's turn to WG-llvm</p>



<a name="173295487"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295487" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295487">(Aug 15 2019 at 14:37)</a>:</h4>
<h1>WG-LLVM</h1>



<a name="173295495"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295495" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295495">(Aug 15 2019 at 14:37)</a>:</h4>
<p><span class="user-mention" data-user-id="123586">@nagisa</span> or <span class="user-mention" data-user-id="133224">@Nikita Popov</span> -- any updates there?</p>



<a name="173295766"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295766" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295766">(Aug 15 2019 at 14:41)</a>:</h4>
<p>OK!</p>



<a name="173295768"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295768" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295768">(Aug 15 2019 at 14:41)</a>:</h4>
<p>I'm going to assume not :)</p>



<a name="173295775"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295775" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295775">(Aug 15 2019 at 14:41)</a>:</h4>
<p>So we have 20 minutes remaining</p>



<a name="173295778"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295778" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Hanna Kruppe <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295778">(Aug 15 2019 at 14:42)</a>:</h4>
<p>I'm not either one but I'd like to point out this LLVM patch <a href="https://reviews.llvm.org/D65718" target="_blank" title="https://reviews.llvm.org/D65718">https://reviews.llvm.org/D65718</a> which is related to <a href="https://github.com/rust-lang/rust/issues/28728" target="_blank" title="https://github.com/rust-lang/rust/issues/28728">#28728</a> (either documenting the LLVM semantics we have to work around to fix that issue, or perhaps finally causing LLVM to allow us to opt out of those semantics without adding <code>@llvm.sideeffect</code> calls everywhere)</p>



<a name="173295851"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295851" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295851">(Aug 15 2019 at 14:42)</a>:</h4>
<p>Interesting. I was just going to bring up that PR</p>



<a name="173295854"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295854" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295854">(Aug 15 2019 at 14:42)</a>:</h4>
<p>to ask whether any measurements had happened</p>



<a name="173295877"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295877" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295877">(Aug 15 2019 at 14:43)</a>:</h4>
<p>If I understand that patch, it sounds like it is saying "llvm.sideeffect" <em>is</em> the answer</p>



<a name="173295892"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295892" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295892">(Aug 15 2019 at 14:43)</a>:</h4>
<p>There were much confusion about these guarantees recently. E.g. there was a differential that added another optimisation that assumed such guarantees</p>



<a name="173295902"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295902" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295902">(Aug 15 2019 at 14:43)</a>:</h4>
<p>but <span class="user-mention" data-user-id="133224">@Nikita Popov</span> will know better what’s happening there.</p>



<a name="173295907"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295907" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295907">(Aug 15 2019 at 14:43)</a>:</h4>
<p>I didn’t follow it too closely</p>



<a name="173295961"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295961" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Hanna Kruppe <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295961">(Aug 15 2019 at 14:44)</a>:</h4>
<p>"llvm.sideeffect is the answer" is the current diff and initial intent, but some discussion hints that there's perhaps a desire to settle this properly instead of documenting an unclear/inconsistent status quo</p>



<a name="173295978"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295978" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295978">(Aug 15 2019 at 14:44)</a>:</h4>
<p>( PR in question:  Add llvm.sideeffect to potential infinite loops and recursions <a href="https://github.com/rust-lang/rust/issues/59546" target="_blank" title="https://github.com/rust-lang/rust/issues/59546">#59546</a> )</p>



<a name="173295991"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173295991" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173295991">(Aug 15 2019 at 14:45)</a>:</h4>
<p>I see</p>



<a name="173296034"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173296034" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173296034">(Aug 15 2019 at 14:45)</a>:</h4>
<p>it sounds like <a href="https://github.com/rust-lang/rust/pull/59546#issuecomment-515593132" target="_blank" title="https://github.com/rust-lang/rust/pull/59546#issuecomment-515593132">somebody ran the benchmarks</a>, but we didn't <em>quite</em> get the point of doing comparisons :)</p>



<a name="173296146"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173296146" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173296146">(Aug 15 2019 at 14:47)</a>:</h4>
<p>ok, I left a few comments</p>



<a name="173296166"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173296166" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173296166">(Aug 15 2019 at 14:47)</a>:</h4>
<p>we'll see if we can push that along</p>



<a name="173296283"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173296283" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173296283">(Aug 15 2019 at 14:48)</a>:</h4>
<p>OK, we've got 10 minutes left.</p>



<a name="173296314"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173296314" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173296314">(Aug 15 2019 at 14:49)</a>:</h4>
<p>let me call attention to a few more P-high bugs</p>



<a name="173296345"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173296345" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173296345">(Aug 15 2019 at 14:49)</a>:</h4>
<p>and I suggest people <a href="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+is%3Aissue+label%3AT-compiler+label%3AP-high+" target="_blank" title="https://github.com/rust-lang/rust/issues?utf8=%E2%9C%93&amp;q=is%3Aopen+is%3Aissue+label%3AT-compiler+label%3AP-high+">review the list</a> to look for things either assigned to you, unassigned, or which potentially don't belong :)</p>



<a name="173296409"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173296409" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173296409">(Aug 15 2019 at 14:50)</a>:</h4>
<p><span class="user-mention" data-user-id="123586">@nagisa</span>, <span class="user-mention" data-user-id="124289">@rkruppe</span> or <span class="user-mention" data-user-id="133224">@Nikita Popov</span>:</p>
<p>I wanted to call attention to this bug, which looks like an LLVM misoptimization?</p>
<blockquote>
<p>Weird compiler behavior with in-lining of a function -&gt; constant value arbitrary changed <a href="https://github.com/rust-lang/rust/issues/63516" target="_blank" title="https://github.com/rust-lang/rust/issues/63516">#63516</a></p>
</blockquote>



<a name="173296421"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173296421" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> mw <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173296421">(Aug 15 2019 at 14:50)</a>:</h4>
<p>we might also want to make this p-high: <a href="https://github.com/rust-lang/rust/issues/57822" target="_blank" title="https://github.com/rust-lang/rust/issues/57822">https://github.com/rust-lang/rust/issues/57822</a></p>



<a name="173296445"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173296445" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> mw <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173296445">(Aug 15 2019 at 14:51)</a>:</h4>
<p>it seems to be very disruptive for some people and it is <em>my</em> highest priority at the moment</p>



<a name="173296471"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173296471" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173296471">(Aug 15 2019 at 14:51)</a>:</h4>
<p>done</p>



<a name="173296475"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173296475" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173296475">(Aug 15 2019 at 14:51)</a>:</h4>
<p>any idea what's the cause?</p>



<a name="173296492"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173296492" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> mw <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173296492">(Aug 15 2019 at 14:51)</a>:</h4>
<p>I'm currently trying to find out</p>



<a name="173296542"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173296542" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> mw <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173296542">(Aug 15 2019 at 14:52)</a>:</h4>
<p>some edge case in LLDBs code that rustc triggers but clang doesn't</p>



<a name="173296548"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173296548" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173296548">(Aug 15 2019 at 14:52)</a>:</h4>
<blockquote>
<p><span class="user-mention silent" data-user-id="123586">nagisa</span>, <span class="user-mention silent" data-user-id="124289">rkruppe</span> or <span class="user-mention silent" data-user-id="133224">Nikita Popov</span>:</p>
<p>I wanted to call attention to this bug, which looks like an LLVM misoptimization?</p>
<blockquote>
<p>Weird compiler behavior with in-lining of a function -&gt; constant value arbitrary changed <a href="https://github.com/rust-lang/rust/issues/63516" target="_blank" title="https://github.com/rust-lang/rust/issues/63516">#63516</a></p>
</blockquote>
</blockquote>
<p>on this note, at some point I recall <span class="user-mention" data-user-id="116083">@pnkfelix</span> talking about coming up with some guidelines for how to try to narrow down LLVM failures, but that never happened, right? This seems like a case where that'd be useful</p>



<a name="173296596"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173296596" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173296596">(Aug 15 2019 at 14:53)</a>:</h4>
<p>I guess we'll settle for calling attention to it as well ("calling LLVM specialists")</p>



<a name="173296600"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173296600" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nikomatsakis <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173296600">(Aug 15 2019 at 14:53)</a>:</h4>
<p>ok, let's call it for the day then. thanks all! :)</p>



<a name="173296671"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173296671" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> Hanna Kruppe <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173296671">(Aug 15 2019 at 14:54)</a>:</h4>
<p>Definitely needs a smaller MCVE before I can say anything more. I glanced at the repo a bit and it's big enough I wouldn't be <em>surprised</em> if it's something else (e.g. UB in a dependency or a mistake in the linker script or other build system parts)</p>



<a name="173296811"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173296811" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173296811">(Aug 15 2019 at 14:56)</a>:</h4>
<p>it <em>almost</em> sounds like the value flows into something  that adds that 0x8 value, but maybe <em>that</em> part is caused by UB</p>



<a name="173296830"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173296830" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> eddyb <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173296830">(Aug 15 2019 at 14:56)</a>:</h4>
<p>I <em>definitely</em> don't trust assembly to tell us much</p>



<a name="173298746"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173298746" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173298746">(Aug 15 2019 at 15:21)</a>:</h4>
<p>that was my first thought as well</p>



<a name="173298760"></a>
<h4><a href="https://rust-lang.zulipchat.com#narrow/stream/131828-t-compiler/topic/weekly%20meeting%202019-08-15%20%2354818/near/173298760" class="zl"><img src="https://rust-lang.github.io/zulip_archive/assets/img/zulip.svg" alt="view this post on Zulip" style="width:20px;height:20px;"></a> nagisa <a href="https://rust-lang.github.io/zulip_archive/stream/131828-t-compiler/topic/weekly.20meeting.202019-08-15.20.2354818.html#173298760">(Aug 15 2019 at 15:21)</a>:</h4>
<p>like being inlined into the code whhich can infer that the 0x8 bit is definitely set</p>



<hr><p>Last updated: Aug 07 2021 at 22:04 UTC</p>
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